M. C. VAN DUZEE 79 



THE GENUvS XIPHANDRIUM LOEW IN NORTH AMERICA 

 (DIPTERA; DOLICHOPODIDAE) 



BY M. C. VAN DUZEE 

 Buffalo, New York 



111 1S99, Dr. Wheeler descrilied as Porphi/rops xipherea, a 

 tyjiical species of the genus Xiphnndiiuiii, although hitherto it 

 has never been placed therein. This is the only described s])ecies 

 of the genus from North America. Having five new species and 

 a variety in my collection, I am descril)ing these; no doul)t others 

 have unrecognized material in this interesting little genus. 



I have taken them only by sweeping in rather swampy, sunny 

 ]ilaces where there was short grass. 



They reseml)le small PorphyropH, being from 2.5 to 3.5 nnn. 

 in length, with long strap-lik(^ third antennal joints, usually 

 from six to ten times as long as wide; tlu; arista is terminal, rather 

 thick and short, usually about as long as the width of the front; 

 the middle coxae usually have a spine or thorn at tip as in many 

 of the Porphyrops, these spines are often pale in color. The 

 wings are much like those of Porphyrops, except that they are 

 narrower, especially at base. When once recognized the genus 

 is easily cHstinguished from the related genera. 



Table of North American Species, Males 



1. All coxae yellow 2 



At least middle and hind coxae blackened at base for half t heir leiifil h } 



2. Hind femora wholly yellow; hind tibiae brownisli yellow, darker apically. 



(Georgia) flavicoxa new species 



Tips of hirul femora and the whok; of their tibiae and tarsi black 3 



3. Outer lamellae short; hypopygium as in figure 5. (New York.) 



femineum new species 

 Outer lamellae rather long as in figure 7. (Xew "^'ork.i 



femineum var. dubium new variety 



4. Third antennal joint nearly, or even more than, twice as long as tiie height 



of the head 5 



Third antennal joint about as long as the height of the head 6 



5. Outer hypopj-gial appendages filiform, as in figure 2. (Colorado.) 



longicorne new sjiecies 

 Outer hy])()pygial appendages lamellae-like, as in figure 9. (.\laska.) 



aldrichi new species 



TKANS. AM. ENT. SOC, XLVHI. 



